<form class="form-signin" method="post" role="form">
    <h2 class="form-signin-heading">登录</h2>
    <input type="text" class="form-control" name="account" placeholder="Email address" required autofocus>
    <input type="password" class="form-control" name="password" placeholder="Password" required>
    <label class="checkbox">
      <input type="checkbox" value="remember-me"> Remember me
    </label>
    <button class="btn btn-lg btn-primary btn-block" type="submit">Sign in</button>
</form>